At least 10 people were killed in clashes between Houthis and militiamen in the Yemeni city of Taiz on the last day of the humanitarian ceasefire between Iran-backed Houthis and Saudi Arabia, Reuters has reported.
Clashes also took place in Dhalea city of Yemen on Saturday night but no casualties were reported.
UN envoy to Yemen, Ismail Ould Sheikh Ahmed said he was "very worried about violations of the truce", urging all sides to "strictly respect a cessation of military operations to allow the flow of desperately needed aid”.
Backed by Iran, the Houthis took control of the Yemeni capital of Sanaa in September through an armed uprising, causing the Yemeni government to flee to Aden after the group attempted to disband it in January.
Houthi forces began a military campaign to take Aden in April, forcing the government to flee the country to neighboring ally Saudi Arabia where it has set up office in the capital, Riyadh.
The Saudi-led 12-country coalition began air strikes in Yemen against the Houthis in response to appeals from Hadi to “save Yemen” from Houthi aggression last March. The coalition has been conducting the air strikes on a daily basis.
Saudi-proposed a five-day ceasefire that started late Tuesday. The ceasefire was announced after a visit by US secretary of state John Kerry to Riyadh to meet with Saudi king Salman.
The coalition accuses the Iran-backed rebels of violating the ceasefire for the second day in a row by carrying out military operations, including shelling Saudi troops in the border zone and targeting citizens' homes, according to a statement carried by the official Saudi Press Agency.
A Saudi-led coalition spokesperson warned that the five-day humanitarian truce may not last long, due to allegedly frequent breaching of the agreement by the Houthis.
A conference between Yemeni political groups has been scheduled by President Hadi's government for Monday in Riyadh after the ceasefire ends.